* {
    margin: 0;
    padding: 0;
}
body {
    background-color: #edf0f6;
}
header {
    position: absolute;
    left: 0;
    width: 100%;
    height: 50px;
    background-color: #071e42;
    color: white;
}
sider {
    position: absolute;
    height: calc(100% - 50px);
    width: 60px;
    top: 50px;
    left: 0;
    background-color: #f5f7fa;
}
main{
    position: absolute;
    top: 50px;
    left: 80px;
    width: calc(100% - 80px);
    height: calc(100% - 50px);
}
#title {
    position: absolute;
    margin-top: 23px;
    margin-bottom: 23px;
    font-size: 24px;
    width: 100%;
}
.detail {
    position: absolute;
    top: 74px;
    width: calc(100% - 23px);
    height: calc(100% - 74px);
    background-color: white;
}

ul {
    position: absolute;
    width: 100%;
    height: 100%;
}

li {
    text-align: center;
    vertical-align: center;
    width: 100%;
    height: 40px;
}


img {
    padding-top: 10px;
}